This saline cartridge contains a sterile solution for the Sperian 2000 Emergency Eyewash Station, Item Number 147574. This sterile solution comes in a factory-sealed cartridge and is superior to using ordinary tap water to manually mix and measure eye-wash solution. Plumbed or other tank-type eyewash devices may contain harmful bacteria, molds or fungi that can contaminate the fluid and cause additional eye damage. A sterile or buffered saline solution is the most effective flushing fluid for emergency first aid. Cartridge has a 24-month life, determined by date of manufacture.